Rules FAQ:
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You need to have a valid target (an opponent's character) in order to trigger the Tower's ability.
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First you pay costs (kneel Tower and return a character to your hand), then your opponent can cancel the effects of the ability (e.g. via Treachery). The costs are paid in either case.
- If you use a duplicate to save your character from returning to hand, the ability is aborted, and its effect does not resolve.